Using OEM parts is always recommended. Will aftermarket headers cause my car to fail the smog test? Unless the aftermarket headers you purchase and install have an EO stamp, meaning they have been tested by the California Air Resource Board and been issued an Executive Order number, yes they will fail the smog inspection; as a tampered emission component.
Exhaust headers, not to mention the entire AIR Air injection system is an "emissions component". Any modification to the headers, intake manifold, or exhaust manifold, including removal of a "Y" tube from the exhaust pipes if equipped is considered an emissions tamper. Your vehicle will fail the smog inspection even before the tailpipe exhaust is checked. Mufflers : The smog test does not test the muffler. However we don't recommend you take the vehicle in for testing if your vehicle's muffler is broken or has holes in it from damage or rust.
It may cause the smog technician problems getting the smog machine to accept testing your vehicle. Smog machines are calibrated in California every three days, and are designed to not allow the testing of vehicles which emit oxygen levels exceeding a smog machines preset limits.
In other words, if your vehicle's muffler has large holes which are allowing oxygen to be vacuumed in with the emissions stream, the test results would have been inaccurate. All Rights Reserved.
Exempt Vehicles. Remember Me? BMW Models. Results 1 to 18 of Thread: aftermarket headers, any gains? Thread Tools Show Printable Version. Looking into IE's header. They won't pass the visual inspection. Posts My Cars e. Drive it like you stole it! Originally Posted by The Sublime. It won't matter if they are wraped or not, they are very obviously not stock once on the car.
I was just sayin for the visual test - if anyone looks down there, wrapped headers aren't illegal So is more like visual inspection thing. I don't recall them looking at it when I had it smogged last time. Most people at emmision don't know what the stock stuff is suposed to look like. One way is to fabricate a steel sheetmetal heat shield over the headers.
The problem is trying to make them look stock. It's run by a sweet old father and his son. They both know cars and take the smog tests seriously. In fact, even though they know me, I'm sure that if I begged them to look the other way and pass my visual, they wouldn't do it. He ran a tailpipe test and the car passed with flying colors - just as good as spec.
He did a visual check and was mostly concerned that the cat was there. He checked to be sure the computer was stock. He looked over the engine and didn't see anything that worried him. I asked him to be sure there was nothing fishy and, as far as he was concerned, if the cat was intact and the tailpipe passed, the car was good. He said if it were a real inspection the car would pass brilliantly. On the way home, on a whim I decided to take it to another test-only center.
This place is a more 'professional' looking shop. It's a chain where the employees wear uniforms and you get the feeling that if even the slightest detail is circumspect, you're in trouble.
And I was. After ten minutes of the visual, the tester came out and said it looked like the car had an aftermarket exhaust manifold. I asked him to run a tailpipe anyway just to see, and he refused - what was the point of a checking the emissions if it was going to fail the visual? So there you have it. While I personally would never drive a car that failed emissions, I have no problem with a car that has illegal mods as long as it is running clean.
If you're in this catagory and need to pass, there ARE smaller shops that will pass you without a payoff.
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